Okadaic Acid

Name Okadaic Acid
Supplier Cell Signaling Technology
Catalog 5934
Prices $99.00
Sizes 25 µg
Formula C44H68O13
Molecular Weight 805.00 g/mol
Purity >98%
Description Okadaic acid is an inhibitor of the serine/theorine protein phosphatases PP1 (IC 50 = 15-20 nM) and PP2A (IC 50 = 0.1 nM), exhibiting much greater activity towards the latter. PP2A is completely inhibited at 1-2 nM, compared to greater than 1 µM for PP1 (1). This is unlike the protein phosphatase inhibitor Calyculin A, which potently inhibits both PP1 (IC 50 = 2 nM) and PP2A (IC 50 = 0.5-1 nM) (2). Okadaic acid does not effectively inhibit PP2C (3), acid and alkaline phosphatases, nor phosphotyrosine protein phosphatases (2,3). It has shown to inhibit PP2B, but at much higher concentrations than with PP1 and PP2A (3). Okadaic acid has also been described as a non-TPA type potent tumor promoter (4). These tumor-promoting properties and its ability to significantly increase protein phosphorylation make okadaic acid a very useful tool for studying cellular processes that are regulated by reversible phosphorylation of proteins (5).
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